Speciation analysis and significance of ecological geochemistry     

Yaping WANG Chunxue XU Ziyi AN Suming WANG 《中国地球化学学报》2006,25(B08):205-205

Different species of one element have different activities, so it has different effects on environment and human health. To analyze qualitatively and quantitatively the speciation of a special element in sample, which is the important basis for appraising the toxicity and studying the rule of transfer and translation of elements. Since the 1970＇s, the scheme of sequential extraction has already been used at many laboratories both at home and abroard, to get the information about heavy metals＇ activity in polluted soils. Because this method has the experimental nature, many schemes of problem has taken place, the absence of consistency of these sequential extraction have been formed. Thus the complexity of the schemes, the lack of selectivity of reagent, the lack of quality control, the result mainly related to the extraction scheme used, and so on. In the face of these problems, the study of experimental methods of sequential extraction on three different soils, sediment in Dongting Lake, soil in Jiangsu Province and loess in Shanxi Province was made. Reference materials of heavy metal speciation following sequential extraction in soil and sediment had been developed. Nowadays two kinds of sequential extraction methods which are widely used are BCR （three steps） and improved Tessier methods （seven steps）. Based on three steps of BCR, water-soluble speciation and the residual speciation were increased in our research. BCR701 was determined eight times at different laboratories using BCR three steps. The results showed that determined data obtained eight times were identical to the standard value, and it is indicated that this method has good reproducibility. The stability and homogeneity experiments indicated that the preparation of three types of candidates accorded with our requirements. Eight laboratories had afforded the determined values of 12 heavy metal elements （Cu, Pb, Zn, Mn, Co, Ni, Cd, Cr, Mo, As, Sb, Hg, Se et al.） using BCR three steps. Also, these three candidates afforded the determined values by seven steps, and 12 laboratories had participated.  相似文献   

Berriasian (Lower Cretaceous) brachiopods from the Crimea     

S. V. Lobatscheva  T. N. Smirnova 《Stratigraphy and Geological Correlation》2006,14(6):642-654

Four successive assemblages of Berriasian brachiopods distinguished for the first time in the Crimea are correlated with concurrent subdivisions of the ammonoid scale. Berriasian brachiopods are represented by 44 species of 27 genera and 14 families, which are most complete in terms of taxonomic composition as compared to other concurrent brachiopod faunas known elsewhere. The assemblages are dominated by local species. As is proved, the Berriasian brachiopods studied are appropriate for age determination, subdivision and correlation of their host deposits. Their geographic distribution that has been analyzed elucidates connections of the Berriasian sea basins within the Mediterranean paleozoogeographic region.  相似文献   

塔里木盆地东河砂岩沉积和储层特征及综合分析   总被引：21，自引：0，他引：21  

贾进华  张宝民  朱世海  朱运成  李占银 《古地理学报》2006,8(3):339-352

东河砂岩是一套海侵初期的沉积产物，东河砂岩不是一个等时沉积体，相当于晚泥盆世晚期至早石炭世早期沉积，具体沉积时间各地有差异。由于东河砂岩是覆盖广泛的海侵初期沉积，因此具有海侵初期填平补齐的特征，其沉积相决定于海侵的速度、沉积物的供给和海侵前的古地貌。塔北地区受塔北古隆起的阻挡，海水在古隆起周围滞留时间较长，又有较粗粒的物源供给，其沉积产物主要是滨岸海滩沉积；塔中地区由于地形复杂，沉积类型也比较复杂，底部砾岩段有河流相沉积，而块状砂岩段和砂砾岩段有河口湾和滨岸海滩沉积，不同段在成分、分选性和粒级上有较大的差异；而其它低平地区主要是海侵期快速的滨岸和陆架沉积。受沉积因素影响，东河砂岩有效储层的分布具有地域性；除沉积因素外，低的地温梯度和短期的深埋藏是优质储层发育的重要控制因素。  相似文献   

Gzhelian fusulinids first discovered in central Iran     

E. Ya. Leven  M. H. Gorgij 《Stratigraphy and Geological Correlation》2006,14(1):19-29

Gzhelian deposits established in Iran for the first time are described. They rest with a considerable hiatus on the Moscovian deposits constituting, along with Asselian strata, an integral carbonate succession of the Zaladu Formation in eastern Iran. The Zaladu Formation is correlative with the Vazhnan Formation of the Abadeh region (central Iran) and the Dorud Formation of the Elburz (Alborz) Mountains. An assemblage of Gzhelian fusulinids from the studied section is well comparable with the assemblage of the Ultradaixina bosbytauensis Zone distinguished in the uppermost Gzhelian of the Darvaz, Fergana, the Southern Urals, Donetsk Basin, and Carnic Alps. Two new species of the genus Schellwienia (Sch. anarakensis and Sch. stocklini) are described. Gzhelian and Asselian fusulinids found in the section are figured in two paleontological plates.  相似文献   

吉尔嘎朗图凹陷宝饶洼槽下白垩统层序地层与沉积体系     

易定红  石兰亭  曹正林  贾义蓉  李林波 《华东地质学院学报》2006,29(1):22-26

运用高分辨率层序地层学原理和方法,通过对钻井和地震资料的综合分析,在二连盆地吉尔嘎朗图凹陷下白垩统中识别出1个超长期基准面旋回(二级层序)SSC1和5个长期基准面旋回(三级层序):LSC1,LSC2,LSC3,LSC4,LSC5,分析了各旋回的发育特征。识别出五种类型的沉积体系:滨浅湖近岸水下扇、较深水湖浊积扇、滨浅湖扇三角洲、滨浅湖辫状河三角洲和河流沉积体系,并在等时地层格架内分析了各基准面旋回的沉积体系构成和储层砂体的发育情况。综合分析生、诸、盖条件后认为,在垂向上,LSC3旋回为本区最有利的储集层段,在平面上,本区的油气勘探应主要寻找宝饶构造带辫状河三角洲前缘砂体,主要储层砂体类型为前缘分流水道砂和前缘席状砂。  相似文献   

Vertical variation of phosphorus forms in surface sediments from Wuli Bay, Taihu Lake, China   总被引：1，自引：0，他引：1  

李军  刘丛强  王仕禄  朱兆洲  周志华  肖化云 《中国地球化学学报》2006,25(3):279-284

1IntroductionPhosphorus,an essential nutrient for the primaryproductivity in freshwater systems,is an important fac-tor controlling lacustrine eutrophication.Although ex-ternal input of phosphorus has been assumed as the vi-tal responsibility for the eutrophication of lakes(ZhuJun et al.,2005),the remobilization of phosphorus insediments has a distinct influence on it as well(Bostr m et al.,1982).The concentrations of totalphosphorus(Ptotal)in the sediments are often related tothe trophic st…  相似文献   

黄骅坳陷北大港构造带古近系沙河街组高分辨率层序地层格架及其对储层非均质性的控制   总被引：9，自引：1，他引：9  

范乐元  朱筱敏  宋鹍  朱之春  谢楠 《地层学杂志》2005,29(4):355-361,367

陆相湖盆层序的发育是在湖盆蓄水量周期性变化的条件下实现的。层序发育过程实际上是基准面旋回变化过程中湖泊冲刷沉积作用彼此消长的过程。北大港构造带古近系沙河街组可划分为2个长期基准面旋回、8个中期基准面旋回和43个短期基准面旋回。在等时地层格架内,基于基准面变化过程中的沉积响应及其伴生的可容空间变化的分析,探讨了基准面旋回变化与储层展布及储层非均质性之间的相关关系:基准面旋回的升降变化对储层的非均质性、空间展布以及有利储层的分布等均具有明显的控制作用;短期基准面旋回控制储层砂体内部的非均质模式,中长期基准面旋回控制了储层砂体的层间非均质性特征;在中长期基准面低位处,尤其是在基准面旋回的转换点处,储层发育良好,砂体厚度、展布面积均较大,物性相对较好;而在中长起基准面较高位处,则出现相反的储层特征。  相似文献   

地震属性分析中水平切片的应用   总被引：6，自引：0，他引：6  

国洪伟  陈勃  刘和芝  刘伟  张秀丽 《物探化探计算技术》2005,27(1):10-15

利用地震数据体中含有的丰富地质信息,可以有效地进行储层预测。层拉平水平切片地层学解释方法是先将地震剖面目的层段做层拉平处理,然后对切片顺地层层面追踪,勾绘出各种地层现象,并以地层学的观点加以解释。该方法在吉林探区扶新南部地区的应用中,对于识别河道的展布趋势取得了较好的效果,而且发现了多期叠置的扇型沉积体。另外,还可指导反演数据体的解释,做到对岩性体从定性到定量的描述。  相似文献   

黄骅坳陷扣村地区古近系沙三段高分辨层序地层分析     

王世军  肖建玲  朱敏  张孟 《新疆地质》2005,23(2):158-163

通过利用钻井、测井、地震等多种资料，以黄骅坳陷扣村地区古近系沙三段为例，详细论述了开展高分辨层序地层分析的研究流程、方法．在四级层序格架确定的基础上，叙述了以一般湖泛面和更小级别的岩性和结构层序单元界面的识别与类型的确定．指出通过露头、岩心、测井曲线和高分辨地震信息，可以确定短期旋回界面与超短期旋回界面．根据工区的特点选取主干剖面，建立高分辨率层序地层网络格架对比剖面，开展长、中、短期基准面旋回的分析、高分辨率层序地层的单砂体展布分析及其沉积微相研究．  相似文献   

陈家庄凸起北坡古近系层序地层特征及沉积体系     

庄博  刘玉琴  张建中 《新疆地质》2005,23(2):164-168

陈家庄凸起北坡发育了多种类型的储集体．根据岩心、钻井和测井资料，以层序地层学理论和方法为指导，从分析、识别层序的主要界面，如层序界面、初始湖泛面、最大湖泛面等入手，对陈家庄凸起北坡古近系层序、准层序和体系域进行了划分．通过钻井层序分析与地震层序解释，在层序地层分析的基础上，对沉积体系进行了研究．指出本区发育的低位域水下扇、低位域复合扇、湖扩展体系域滨岸沉积和高位域三角洲沉积等，是进行岩性油藏勘探的有利目标．  相似文献